Hello all! I am a hobby rocket-eer. I am building a two-stage model using composite motors. For those who might not be familiar with the motors, the standard "black powder" rocket motors can be staged by "butting" the motors together. When the bottom motor burns through, it ignites the second motor. Composite motors cannot be staged this way. therefore, the upper stage must carry it's own electronic charge. A booklet from the mid to late 80's says you can store a charge using a capacitor (it calls for using a mercury switch to complete the circuit, but I won't be using one, due to the toxicity issue. I will instead use a "G-switch" from www.aeroconsystems.com). The ignitor requires 12-volts at 2-to-3 amps! Is it possible to store that much current in a capacitor? (I may not be using the correct terminology, as I am NOT an electronics guy.) There are commercially made barometric altimeters that require one or two 9-volt batteries. This is not an option for me due to the excessive weight. Any help would be appreciated!